Every 2 rows (2x2 matrix) to perform determinant calculation

13 次查看（过去 30 天）
cool dave
cool dave 2013-11-24
评论： cool dave 2013-11-25
Hi all, can i know how to extract every two rows of my data to perform determinant calculation?
For example i have data:
1 2
3 4
5 6
7 8
9 10
11 12
so i want to select every two rows in order to perform determinant calculation, how can i do that? my final results should be:
-2
-2
-2
Regards,

请先登录，再回答此问题。

采纳的回答

Matt J
Matt J 2013-11-24
m=size(data,1);
i=1:2:m;
j=2:2:m;
determinants = data(i,1).*data(j,2)-data(j,1).*data(i,2),
  3 个评论
显示 1更早的评论
Matt J
Matt J 2013-11-25
编辑：Matt J 2013-11-25
results = bsxfun(@times,r,n);
or
results = kron(r,[1;1]).*data

请先登录，再进行评论。

更多回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-11-24
A=[1 2 ;3 4 ;5 6 ;7 8 ;9 10 ;11 12 ]
B=reshape(A',2,2,[])
out=arrayfun(@(x) det(B(:,:,x)),1:size(B,3))
cool dave
cool dave 2013-11-25
thank you so much of both of your responses, appreciate :)

类别

在 Help Center 和 File Exchange 中查找有关 Vector Volume Data 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by